Fig. 4.

Diagrammatical illustration of the changes observed during early stages of sporulation. (A) An unsporulated oocyst (zero hour). (B) A sporulating oocyst; (C) Formation of the sporoblasts; (D) Early sporoblasts. CE = centriole; ER = rough endoplasmic reticulum; G = Golgi body; L = lipid droplets (green); MI = mitochondrion (yellow); MP = micropore; N = nucleus (blue); NP = nuclear pole; NU = nucleolus; OW = oocyst wall; PG = polysaccharide granule (red); V = vacuole. From Ferguson et al. (1979a) with permission.(For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)